In the grid below, each number can be obtained through the sum of the two numbers connected directly below it. For instance, in
the last row, the 5 is the sum of the two numbers below it, 2 and 3. Using the same method, all the numbers starting from the bottom row sums all the way up to the final square, 2x. Determine the value of x if the number in the topmost square is double unknown number in the bottom row.
1 answer:
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Answer:
Angle bisector
Step-by-step explanation:
Find the measure of the angle COA. By angle addition postulate,
From the diagram,
then
Find the measure of the angle BOA. By angle addition postulate,
From the diagram,
then
Find the measure of the angle COB. By angle addition postulate,
From the diagram,
then
This means, the measures of angles COB and BOA are the same and are equal half the measure of angle COA, so angles COB and BOA are congruent. This means, the ray OB is the angle bisector of angle COA